16. Saliva

daily production of saliva

ranges 0.75-1.5L

salivation nearly stops during sleep

rough percentages saliva secreted by each gland

submandibular 70-75%

parotid 20-25%

sublingual, minor glands small amounts

salivary glands are divided into lobules containing

acini and ducts

3 forms of acini by types of epithelial cell present and secretory product produced:

serous, mucoserous, mucous

describe structure of acinus > lobule > gland > lumen

half of orange w triangular lobes

each lobe = secretory cell in acinus at terminal part of gland (many acinus in each lobule) connected to ductal system

each acinus = single layer cuboidal epithelial cells around lumen deposit saliva

secretions of acini drained by

intercalated ducts > join to form striated ducts > drain into interlobar/secretory ducts

all human salivary glands terminate in

the mouth

each mainly serous parotid gland lies

posterior to mandibular ramus, anterior to mastoid process of temporal bone

4 surfaces and 3 borders of parotid gland

surfaces: superficial/lateral, superior, anteromedial, posteromedial

borders: anterior, medial, posterior

parotid duct emerges from

anterior surface of each gland, superficial to masseter

pierces buccinator muscle, opens into mouth inner surface cheek by maxillary second molar

parotid papilla

small elevation of tissue marks opening of duct on inner surface cheek

branches of ext. carotid artery that supply parotid gland

superficial temporal and maxillary artery

venous return from parotid gland

retromandibular veins

submandibular gland located

next to lower jaw, superior to digastric muscle

superficial and deep lobes submandibular gland separated by

mylohyoid muscle

duct of Wharton

5cm duct drains submandibular saliva through sublingual caruncles on each side of lingual frenulum ventral tongue into mouth

secretion of submandibular mix of

serous fluid (rich in salivary amylase) and mucus